import React, { useState, ReactElement } from "react";
import { observer } from "mobx-react-lite";
import Image from "next/image";
import Link from "next/link";
import { useRouter } from "next/router";
import { useTheme } from "next-themes";
import useSWR, { mutate } from "swr";
// icons
import { CheckCircle2 } from "lucide-react";
// types
import type { IWorkspaceMemberInvitation } from "@plane/types";
// ui
import { Button, TOAST_TYPE, setToast } from "@plane/ui";
// components
import { EmptyState } from "@/components/common";
import { PageHead } from "@/components/core";
// constants
import { MEMBER_ACCEPTED } from "@/constants/event-tracker";
import { USER_WORKSPACES_LIST } from "@/constants/fetch-keys";
import { ROLE } from "@/constants/workspace";
// helpers
import { truncateText } from "@/helpers/string.helper";
import { getUserRole } from "@/helpers/user.helper";
import { useEventTracker, useUser, useWorkspace } from "@/hooks/store";
import { UserAuthWrapper } from "@/layouts/auth-layout";
import DefaultLayout from "@/layouts/default-layout";
// types
import { NextPageWithLayout } from "@/lib/types";
// services
import { UserService } from "@/services/user.service";
import { WorkspaceService } from "@/services/workspace.service";
// images
import emptyInvitation from "public/empty-state/invitation.svg";
import BlackHorizontalLogo from "public/plane-logos/black-horizontal-with-blue-logo.svg";
import WhiteHorizontalLogo from "public/plane-logos/white-horizontal-with-blue-logo.svg";

const workspaceService = new WorkspaceService();
const userService = new UserService();

const UserInvitationsPage: NextPageWithLayout = observer(() => {
  // states
  const [invitationsRespond, setInvitationsRespond] = useState<string[]>([]);
  const [isJoiningWorkspaces, setIsJoiningWorkspaces] = useState(false);
  // router
  const router = useRouter();
  // store hooks
  const { captureEvent, joinWorkspaceMetricGroup } = useEventTracker();
  const { data: currentUser } = useUser();
  const { fetchWorkspaces } = useWorkspace();
  // next-themes
  const { theme } = useTheme();

  const { data: invitations } = useSWR("USER_WORKSPACE_INVITATIONS", () => workspaceService.userWorkspaceInvitations());

  const redirectWorkspaceSlug =
    // currentUserSettings?.workspace?.last_workspace_slug ||
    // currentUserSettings?.workspace?.fallback_workspace_slug ||
    "";

  const handleInvitation = (workspace_invitation: IWorkspaceMemberInvitation, action: "accepted" | "withdraw") => {
    if (action === "accepted") {
      setInvitationsRespond((prevData) => [...prevData, workspace_invitation.id]);
    } else if (action === "withdraw") {
      setInvitationsRespond((prevData) => prevData.filter((item: string) => item !== workspace_invitation.id));
    }
  };

  const submitInvitations = () => {
    if (invitationsRespond.length === 0) {
      setToast({
        type: TOAST_TYPE.ERROR,
        title: "Error!",
        message: "Please select at least one invitation.",
      });
      return;
    }

    setIsJoiningWorkspaces(true);

    workspaceService
      .joinWorkspaces({ invitations: invitationsRespond })
      .then(() => {
        mutate(USER_WORKSPACES_LIST);
        const firstInviteId = invitationsRespond[0];
        const invitation = invitations?.find((i) => i.id === firstInviteId);
        const redirectWorkspace = invitations?.find((i) => i.id === firstInviteId)?.workspace;
        joinWorkspaceMetricGroup(redirectWorkspace?.id);
        captureEvent(MEMBER_ACCEPTED, {
          member_id: invitation?.id,
          // eslint-disable-next-line @typescript-eslint/no-non-null-asserted-optional-chain
          role: getUserRole(invitation?.role!),
          project_id: undefined,
          accepted_from: "App",
          state: "SUCCESS",
          element: "Workspace invitations page",
        });
        userService
          .updateUser({ last_workspace_id: redirectWorkspace?.id })
          .then(() => {
            setIsJoiningWorkspaces(false);
            fetchWorkspaces().then(() => {
              router.push(`/${redirectWorkspace?.slug}`);
            });
          })
          .catch(() => {
            setToast({
              type: TOAST_TYPE.ERROR,
              title: "Error!",
              message: "Something went wrong, Please try again.",
            });
            setIsJoiningWorkspaces(false);
          });
      })
      .catch(() => {
        captureEvent(MEMBER_ACCEPTED, {
          project_id: undefined,
          accepted_from: "App",
          state: "FAILED",
          element: "Workspace invitations page",
        });
        setToast({
          type: TOAST_TYPE.ERROR,
          title: "Error!",
          message: "Something went wrong, Please try again.",
        });
        setIsJoiningWorkspaces(false);
      });
  };

  return (
    <>
      <PageHead title="Invitations" />
      <div className="flex h-full flex-col gap-y-2 overflow-hidden sm:flex-row sm:gap-y-0">
        <div className="relative h-1/6 flex-shrink-0 sm:w-2/12 md:w-3/12 lg:w-1/5">
          <div className="absolute left-0 top-1/2 h-[0.5px] w-full -translate-y-1/2 border-b-[0.5px] border-custom-border-200 sm:left-1/2 sm:top-0 sm:h-screen sm:w-[0.5px] sm:-translate-x-1/2 sm:translate-y-0 sm:border-r-[0.5px] md:left-1/3" />
          <div className="absolute left-5 top-1/2 grid -translate-y-1/2 place-items-center bg-custom-background-100 px-3 sm:left-1/2 sm:top-12 sm:-translate-x-[15px] sm:translate-y-0 sm:px-0 sm:py-5 md:left-1/3">
            <div className="h-[30px] w-[133px]">
              {theme === "light" ? (
                <Image src={BlackHorizontalLogo} alt="Plane black logo" />
              ) : (
                <Image src={WhiteHorizontalLogo} alt="Plane white logo" />
              )}
            </div>
          </div>
          <div className="absolute right-4 top-1/4 -translate-y-1/2 text-sm text-custom-text-100 sm:fixed sm:right-16 sm:top-12 sm:translate-y-0 sm:py-5">
            {currentUser?.email}
          </div>
        </div>
        {invitations ? (
          invitations.length > 0 ? (
            <div className="relative flex h-full justify-center px-8 pb-8 sm:w-10/12 sm:items-center sm:justify-start sm:p-0 sm:pr-[8.33%] md:w-9/12 lg:w-4/5">
              <div className="w-full space-y-10">
                <h5 className="text-lg">We see that someone has invited you to</h5>
                <h4 className="text-2xl font-semibold">Join a workspace</h4>
                <div className="max-h-[37vh] space-y-4 overflow-y-auto md:w-3/5">
                  {invitations.map((invitation) => {
                    const isSelected = invitationsRespond.includes(invitation.id);

                    return (
                      <div
                        key={invitation.id}
                        className={`flex cursor-pointer items-center gap-2 rounded border px-3.5 py-5 ${
                          isSelected
                            ? "border-custom-primary-100"
                            : "border-custom-border-200 hover:bg-custom-background-80"
                        }`}
                        onClick={() => handleInvitation(invitation, isSelected ? "withdraw" : "accepted")}
                      >
                        <div className="flex-shrink-0">
                          <div className="grid h-9 w-9 place-items-center rounded">
                            {invitation.workspace.logo && invitation.workspace.logo.trim() !== "" ? (
                              <img
                                src={invitation.workspace.logo}
                                height="100%"
                                width="100%"
                                className="rounded"
                                alt={invitation.workspace.name}
                              />
                            ) : (
                              <span className="grid h-9 w-9 place-items-center rounded bg-gray-700 px-3 py-1.5 uppercase text-white">
                                {invitation.workspace.name[0]}
                              </span>
                            )}
                          </div>
                        </div>
                        <div className="min-w-0 flex-1">
                          <div className="text-sm font-medium">{truncateText(invitation.workspace.name, 30)}</div>
                          <p className="text-xs text-custom-text-200">{ROLE[invitation.role]}</p>
                        </div>
                        <span
                          className={`flex-shrink-0 ${isSelected ? "text-custom-primary-100" : "text-custom-text-200"}`}
                        >
                          <CheckCircle2 className="h-5 w-5" />
                        </span>
                      </div>
                    );
                  })}
                </div>
                <div className="flex items-center gap-3">
                  <Button
                    variant="primary"
                    type="submit"
                    size="md"
                    onClick={submitInvitations}
                    disabled={isJoiningWorkspaces || invitationsRespond.length === 0}
                    loading={isJoiningWorkspaces}
                  >
                    Accept & Join
                  </Button>
                  <Link href={`/${redirectWorkspaceSlug}`}>
                    <span>
                      <Button variant="neutral-primary" size="md">
                        Go Home
                      </Button>
                    </span>
                  </Link>
                </div>
              </div>
            </div>
          ) : (
            <div className="fixed left-0 top-0 grid h-full w-full place-items-center">
              <EmptyState
                title="No pending invites"
                description="You can see here if someone invites you to a workspace."
                image={emptyInvitation}
                primaryButton={{
                  text: "Back to home",
                  onClick: () => router.push("/"),
                }}
              />
            </div>
          )
        ) : null}
      </div>
    </>
  );
});

UserInvitationsPage.getLayout = function getLayout(page: ReactElement) {
  return (
    <UserAuthWrapper>
      <DefaultLayout>{page}</DefaultLayout>
    </UserAuthWrapper>
  );
};

export default UserInvitationsPage;